Ncu-Panstarrs Asteroid Lightcurve Campaign
林省文1*, 章展誥1, 葉永烜1
1Institute of Astronomy, National Central University, Taoyuan, Taiwan
* presenting author:Hsing-Wen Lin, email:edlin@gm.astro.ncu.edu.tw
In our periods studies of spin-rate distribution of main-belt asteroids using Palomar Transient Factory (PTF), we found that the distributions are the function of asteroid size and heliocentric distance. In addition, we discovered three super-fast rotators, which their spin-rates are higher than the theoretical break-up limit (< 2 hours). However, two major questions remain: 1. The spin-rate distribution of small C-type asteroids is still unknown because of the small sample of ~3 km sized C-type asteroids. 2. All of the current known super-fast rotators are non-C-type asteroids. Does the C-type super-fast rotators exist?
The C-type asteroids are generally locate at outer main belt region, therefore the 1 meter class PTF survey can only detect the large sized C-type asteroids. To explore the spin period distribution of asteroids and detect the super-fast rotators in the outer main belt region, we survey ~56 square degrees near ecliptic with 10 minutes cadence using the 1.8m Pan-STARRS telescope in October, 2016. This survey has 10sigma detection limit r~ 21.7 and results more than 2000 asteroid lightcurves. In addition, griz colors were also taken for the estimated taxonomy.
In this talk, we will present our preliminary results of this campaign, included the spin-period distributions in different asteroid families and different taxonomy type, and the new super-fast rotator candidates.


Keywords: asteroid, survey